Artha's interface is very light and shows us all the information in a clear and concise manner. The program only offers you the possibility to choose between detailed or straightforward information.
To give Artha more power, it offers us the chance to be able to choose a word from any text and to automatically search for a synonym and a definition of the word by simply pressing a keyboard shortcut, that can even be customized by the user.
As well as the synonyms and definitions of the word, Artha shows antonyms, similar words and word types.
Therefore, if you want to have quick access to a complete synonyms and antonyms dictionary in English, download and install Artha, it's free.